That branch no longer exist, we moved CryptoPassword repo to the cookbooks repo, not sure if it's the same thing:
https://github.com/aerogear/aerogear-ios-cookbook/tree/master/CryptoPassword

It's in Objective-C and using AeroGear 1.6.1, so it needs an update and/or being ported to Swift.
So I'll keep this open to do that work